chore(deps): bump astral-sh/setup-uv from 5 to 7

Bumps [astral-sh/setup-uv](https://github.com/astral-sh/setup-uv) from 5 to 7.
- [Release notes](https://github.com/astral-sh/setup-uv/releases)
- [Commits](https://github.com/astral-sh/setup-uv/compare/v5...v7)

---
updated-dependencies:
- dependency-name: astral-sh/setup-uv
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/backend.yml

@@ -33,7 +33,7 @@ jobs:
         uses: actions/checkout@v7
 
       - name: Installe uv
-        uses: astral-sh/setup-uv@v5
+        uses: astral-sh/setup-uv@v7
         with:
           enable-cache: true
           cache-dependency-glob: apps/backend/uv.lock
@@ -93,7 +93,7 @@ jobs:
         uses: actions/checkout@v7
 
       - name: Installe uv
-        uses: astral-sh/setup-uv@v5
+        uses: astral-sh/setup-uv@v7
         with:
           enable-cache: true
           cache-dependency-glob: apps/backend/uv.lock
@@ -129,7 +129,7 @@ jobs:
         uses: actions/checkout@v7
 
       - name: Installe uv
-        uses: astral-sh/setup-uv@v5
+        uses: astral-sh/setup-uv@v7
         with:
           enable-cache: true
           cache-dependency-glob: apps/backend/uv.lock
@@ -155,7 +155,7 @@ jobs:
       # Pourquoi : pas de cache ici. uvx n'installe pas le projet, le verrou n'alimente donc
       # aucune clé de cache ; la seule roue téléchargée est celle de Bandit.
       - name: Installe uv
-        uses: astral-sh/setup-uv@v5
+        uses: astral-sh/setup-uv@v7
 
       # Pourquoi : le périmètre est `app`, le code livré. Les tests emploient légitimement des
       # secrets factices et des `assert` que Bandit signalerait sans qu'aucun n'atteigne la prod.